Pressure-gage.



G. W. KELLGG.

' PRESSURE GAGE. APPLICATION FILED Nov. 4, 1911.

Patented Nov. 5, 1912.

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Specioation of Letters Paten-t.

rammed Nov'. s, tote.

Application filed November 4, 1911. Serial ANo. '658,507.

'Fo all whom it may concern.:

Be it known that I, Grenen iV. Knniooo, of Rochester, in the county of Monroe. and State of New York, have invented certain new and 'useful Improvements in PressuretGages; and I do hereby declare the following to be va full, clear, andoexaet. description of the same, reference being had to the acv ccmpanying drawings, forming a part of this lspecification, and to the referencenumerals marked thereon.

The present invention relates to pressure gages, beingpartieularly adapted to that class o'ipdevices employed for determining the air pressure wit-hin pneumatic tires, and

- it has for its object to provide aiconstruccasin and its coieratinv )arts in elevation; Fig. 3 is a longitudinalisectional. view;

Fig. d is av transverse sectional viewon the line d--li ot Fig. 2. Fig. 5' is atransverse sectional view on the line of Fig. 2, and Fig. 6 is an enlarged detail view ot the lower portion of Fig. '3.

Similar reference numerals throughout t the several figures indicate the sameparts.

The invention, as illustrated in the present embodiment, comprises an outer casing 1, closed at its upper end7 and having threaded engagement atits lowe'r end with the coupling- Q., the latter being' provided with an upwardly extending;` sleeve 3, within which' 4is secured the inner fasing' fi, which preferably extends to a point slightly below the top of the-outer casing, as shown in Fig. 3.

The coupling 2' may be attached to the valve of the tire in the usual manner ot' this class ot devices, the air passing` upwardly through the inner casing Li and outwardly at the top thereof, and it is necessary to provide member adapted'tohe moved rela-v tively the earrings, by the ire oi air,

to eect operation ofthe indicator. To this end, in the present embodiment, I provide a piston 5 'which is hollowf`and surrounds the inner casing 4, being provided at its upper end with a rubber gasket 6 attached in any suitable manner as by a clamping ring 7, and arranged to engage closely the wall of the outer casing. The piston 5 may be held in its normal, or uppermost position, in any desirable manner," and to this end, in the present embodiment, there is provided a compression spring 8 surrounding the inner casing and seated at its lower end in a recess 9 of the sleeve 3, the spring having engagement at its upper end with. the piston 5.

.The piston 5 is arrange-d to engage an indicator in its downward movement, which latter A1s carried to the lowermostposition' reached by the piston, or to the position indi'cating the pressure within the tire, and

remains in such position after the piston has been returned to itsY normal position by the spring` 8, and to'this end,there is provided an indicatorcomprising preferably a splitsleeve 10 arranged within the outer casing 1 and in trictional engagement. with the walls thereof. The sleeve -10 carries a corrugated iingbr piece 11',` which projects through the slot 12, provided in the outer casing 1. and constitutes an index, or indicator` suitable graduations being arranged von the sleeve 3 adjacent to .the slot.. which coperate with the indicator 11 to afford the desired reading. l l

The inner asing; 4: is provided near .its

lowerv end with an interiorly.formed shoulder to receive the tubular member 13, which is preferablyv driven into the inner casing. Themember 13 has a transverse opening lt connerstiimI with the passage 15 which surrounds the. lower portion ot' the tubular member, andthe lower end of the tubular member 13 is toimed solid as at 1G, aitording;` a'projeetion whiehuengages the valve stem in the'tire and opens `the valve` when the gage is applied, as usual in this class ot devices. suitable meltingq ring 17 ot sott rubber or other yieldable material is arranged about the lower end of the inner casing, and aii'o'rds an air-tight joint when the enge is in use.

The operation of my invention, briefly, is as follows: Upon attaching the device to the valve of a pneumatic tire, the valve being` thereby opened, the air pressure enters spring 8 are balanced, or equalized. t-he removal of the device from the tire, thev closed at the top, 'to be moved wlthin said casing to show the the upper face of piston 5 forcing the same downwardly against the action of the spring 8. In its downward movement, the piston 5 engages the upper edge of the sleeve 10, carrying the latter also downwardly until the pressure of the air and the resistance of the Upon piston 5 returns to its normal position under the iniiuence of spring remains at.' the point to which it has been moved by the piston, thus serving to give an accurate and readily. determinable reading of the pressure existing within the tire. Then it' is to be used again, the indicator may be movedto normal position by a slight pressure 'of the thumb against the thumb piece l1, until the latter engages the upper end of slot 12.'

While I have shown a preferred embodiment of my invention, I do not limit myselic to the exact construction and arra-ngen'ient of parts herein disclosed, for the invention is susceptible of various modifications with-v out departing trom the essential features thereof which comprehends an outer casing and an indicator adapted amount of pressure being determined.

, I claim as my invention:

1. In a pressure gage, the combination with. an outer casing having a closed end, of an inner casing arranged in spaced relation to theA` outer casing and communicating therewith near -the closed. end of the latter, a piston surrounding the inner casing, a spring arranged between the easings, said spring being supported at one end and 'engaging the piston at the other end to hold the same normally at the closed end of the outer casing, said outer casing having an opening therein, and an indicator arranged for movement in the opening and adapted to be engaged and moved by the piston.

2. In a pressure gage, the combination with an outer casing having a closed end, of an inner casing arranged in spaced relation tothe outer casing and communicating therewith near the closed end of the latter, a piston surrounding the inner casing, a spring arranged between the casings, said spring being supported at one en d and engaging the piston at the other end to hold the same normally at the closed end of the outer casing, said outer casing having an 'opening therein, a sleeve within the outer casing having frictional engagement therewith, and an indicator carried by the sleeve, the latter being arranged forengagement with and movement by the piston.

S, but the sleeve 1 0` 3. Ina pressure gage, the combination. with an outer casing having a closed end, of an inner easing arranged in spaced relation to the outer casing and 'communicating therewith near the closed end of the latter, a piston surrounding the inner casing, retarding means arranged in the path of movement of the piston, a sleeve frictionally supported within the outer casing andadapted to'be engaged and moved by the piston, said outer casing havingan openingvtherein, and an indicator carried by the sleeve and visible within the opening.

4. Ina pressure gage, the combination with an outer casing having a closed end, of an inner casing arranged in spaced relation to the outer casinggand communicating therewith near the closed end of the latter, a piston surrounding the inner casing, retarding means arranged in the path oi movement of the pistonand holding' the same normally at the closed end. of the outer easing, the outer casing having an opening therein, and an indicator' visible within the opening and adapted to be held frictionally. within the outer casing and to be engaged and moved by the piston.

5. In a pressure gage, the combination with an outer casing having a closed end, of an inner casing arranged in spaced rela tion to the outer casing and communicating therewith near the closed end of the latter, a piston surrounding the innerv'casing at one end, a sleeve surrounding the opposite end of the inner casing, la spring surrounding the intermediate portion of the inner casing and arranged between the piston and the sleeve, and an indicator held friction-ally within the outer casing and adapted to be engaged and moved by the piston, said outer casing having an opening within which the indicator moves, and said sleeve being provided with graduations for cooperation with the indicator.

6. In a pressure gage, the combination with an outer casing having a closed end, of an inner casing arranged in spaced relation to the outer casing and communicating therewith near the closed end of the latter, a piston surrounding the inner casing, retarding means arranged in the path of movement of the piston to hold the same normally at the closed end of the casing, the outer casing having an opening, and an indicator visible in said opening and arranged to be moved bythe piston.

GEORGE W.i KELLOGG. Witnesses RUSSELL B. GRIFFITH, H. E. S/rONEBnAKEn.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents,

Washington, D. C.

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